[SPARK-19684][DOCS] Remove developer info from docs.
[SPARK-19684][DOCS] Remove developer info from docs.

This commit moves developer-specific information from the release-
specific documentation in this repo to the developer tools page on
the main Spark website. This commit relies on this PR on the
Spark website: https://github.com/apache/spark-website/pull/33.

srowen

Author: Kay Ousterhout <kayousterhout@gmail.com>

Closes #17018 from kayousterhout/SPARK-19684.

mike0sv/spark,xflin/spark,highfei2011/spark,jianran/spark,kiszk/spark,icexelloss/spark,nilsgrabbert/spark,ron8hu/spark,liutang123/spark,eyalfa/spark,jrshust/spark,JoshRosen/spark,facaiy/spark,dhruve/spark,patrick-nicholson/spark,Aegeaner/spark,goldmedal/spark,lxsmnv/spark,adrian-ionescu/apache-spark,mdespriee/spark,chuckchen/spark,skonto/spark,nlalevee/spark,WindCanDie/spark,jianran/spark,1haodian/spark,rednaxelafx/apache-spark,kevinyu98/spark,wzhfy/spark,aosagie/spark,bOOm-X/spark,kissmetrics/spark,techaddict/spark,MLnick/spark,wangmiao1981/spark,cloud-fan/spark,WeichenXu123/spark,JoshRosen/spark,WeichenXu123/spark,ddna1021/spark,ConeyLiu/spark,andrewor14/spark,wangyum/spark,jrshust/spark,aray/spark,ddna1021/spark,1haodian/spark,WindCanDie/spark,wangmiao1981/spark,someorz/spark,poffuomo/spark,adrian-ionescu/apache-spark,ericvandenbergfb/spark,Aegeaner/spark,rezasafi/spark,tengpeng/spark,hvanhovell/spark,saturday-shi/spark,lxsmnv/spark,saturday-shi/spark,shuangshuangwang/spark,vinodkc/spark,facaiy/spark,tengpeng/spark,darionyaphet/spark,liyichao/spark,caneGuy/spark,ConeyLiu/spark,LantaoJin/spark,ron8hu/spark,nlalevee/spark,brad-kaiser/spark,actuaryzhang/spark,Aegeaner/spark,lvdongr/spark,nilsgrabbert/spark,ajaysaini725/spark,jlopezmalla/spark,actuaryzhang/spark,skonto/spark,setjet/spark,jkbradley/spark,poffuomo/spark,jkbradley/spark,adrian-ionescu/apache-spark,hvanhovell/spark,shaneknapp/spark,wangmiao1981/spark,markhamstra/spark,apache-spark-on-k8s/spark,LantaoJin/spark,liyichao/spark,wzhfy/spark,milliman/spark,byakuinss/spark,ioana-delaney/spark,mzl9039/spark,szhem/spark,facaiy/spark,tejasapatil/spark,pgandhi999/spark,maropu/spark,aokolnychyi/spark,caneGuy/spark,brad-kaiser/spark,caneGuy/spark,wangmiao1981/spark,icexelloss/spark,apache/spark,guoxiaolongzte/spark,WeichenXu123/spark,narahari92/spark,dongjoon-hyun/spark,cin/spark,bravo-zhang/spark,bravo-zhang/spark,spark-test/spark,Aegeaner/spark,holdenk/spark,tengpeng/spark,bravo-zhang/spark,pgandhi999/spark,mzl9039/spark,eyalfa/spark,map222/spark,ericvandenbergfb/spark,byakuinss/spark,lxsmnv/spark,mike0sv/spark,esi-mineset/spark,jkbradley/spark,ptkool/spark,bdrillard/spark,milliman/spark,shubhamchopra/spark,jlopezmalla/spark,saturday-shi/spark,panfengfeng/spark,xuanyuanking/spark,jianran/spark,janewangfb/spark,shubhamchopra/spark,sureshthalamati/spark,zuotingbing/spark,cloud-fan/spark,someorz/spark,dhruve/spark,poffuomo/spark,minixalpha/spark,liutang123/spark,liyichao/spark,ericvandenbergfb/spark,saltstar/spark,xuanyuanking/spark,kissmetrics/spark,liutang123/spark,sureshthalamati/spark,jrshust/spark,ioana-delaney/spark,hvanhovell/spark,milliman/spark,darionyaphet/spark,aray/spark,shubhamchopra/spark,gengliangwang/spark,facaiy/spark,tejasapatil/spark,panfengfeng/spark,lxsmnv/spark,Aegeaner/spark,rekhajoshm/spark,mike0sv/spark,techaddict/spark,rezasafi/spark,mdespriee/spark,shuangshuangwang/spark,nchammas/spark,tengpeng/spark,aosagie/spark,joseph-torres/spark,MLnick/spark,byakuinss/spark,pgandhi999/spark,HyukjinKwon/spark,narahari92/spark,dbtsai/spark,akopich/spark,BryanCutler/spark,BryanCutler/spark,ioana-delaney/spark,tejasapatil/spark,xuanyuanking/spark,rikima/spark,dongjoon-hyun/spark,icexelloss/spark,zuotingbing/spark,pgandhi999/spark,bOOm-X/spark,patrick-nicholson/spark,rezasafi/spark,saltstar/spark,witgo/spark,ajaysaini725/spark,lvdongr/spark,dongjoon-hyun/spark,nchammas/spark,rednaxelafx/apache-spark,ddna1021/spark,jkbradley/spark,someorz/spark,alunarbeach/spark,mdespriee/spark,liyichao/spark,zhouyejoe/spark,UndeadBaneGitHub/spark,rekhajoshm/spark,spark-test/spark,dhruve/spark,spark-test/spark,markhamstra/spark,markhamstra/spark,WindCanDie/spark,witgo/spark,brad-kaiser/spark,kevinyu98/spark,HyukjinKwon/spark,witgo/spark,aosagie/spark,icexelloss/spark,rednaxelafx/apache-spark,darionyaphet/spark,BryanCutler/spark,LantaoJin/spark,srowen/spark,szhem/spark,taroplus/spark,nchammas/spark,maropu/spark,sachintyagi22/spark,debugger87/spark,kiszk/spark,dbtsai/spark,zuotingbing/spark,yanboliang/spark,ahnqirage/spark,hvanhovell/spark,ddna1021/spark,bravo-zhang/spark,cloud-fan/spark,zzcclp/spark,akopich/spark,markhamstra/spark,zero323/spark,darionyaphet/spark,dongjoon-hyun/spark,caneGuy/spark,aokolnychyi/spark,zhouyejoe/spark,debugger87/spark,sureshthalamati/spark,szhem/spark,WeichenXu123/spark,holdenk/spark,patrick-nicholson/spark,apache-spark-on-k8s/spark,kissmetrics/spark,caneGuy/spark,bOOm-X/spark,ron8hu/spark,adrian-ionescu/apache-spark,spark-test/spark,zzcclp/spark,stanzhai/spark,techaddict/spark,ericvandenbergfb/spark,ahnqirage/spark,chuckchen/spark,jrshust/spark,eyalfa/spark,cin/spark,JoshRosen/spark,ahnqirage/spark,loneknightpy/spark,dbtsai/spark,kevinyu98/spark,akopich/spark,yanboliang/spark,saturday-shi/spark,jlopezmalla/spark,wangmiao1981/spark,huang1900/spark,patrick-nicholson/spark,nchammas/spark,taroplus/spark,alunarbeach/spark,nilsgrabbert/spark,stanzhai/spark,saltstar/spark,stanzhai/spark,aosagie/spark,zuotingbing/spark,ptkool/spark,nchammas/spark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